#00A8F9

CSS

:root {
  --high-blue: #00a8f9;
  --high-blue-rgb: 0 168 249;
  --high-blue-oklch: oklch(0.699 0.163 241.1);
}

.element {
  color: var(--high-blue);
  background-color: hsl(200 100% 49%);
  border-color: oklch(0.699 0.163 241.1);
}

Tailwind CSS v4

@theme {
  --color-high-blue: #00a8f9;
  --color-high-blue-50: #cefcff;
  --color-high-blue-100: #b9efff;
  --color-high-blue-200: #95ddff;
  --color-high-blue-300: #65c0ff;
  --color-high-blue-400: #21a8f5;
  --color-high-blue-500: #008fe6;
  --color-high-blue-600: #0079c2;
  --color-high-blue-700: #00619c;
  --color-high-blue-800: #004874;
  --color-high-blue-900: #003252;
  --color-high-blue-950: #001d37;
}

SCSS

$high-blue: #00a8f9;
$high-blue-rgb: 0, 168, 249;
$high-blue-light: mix(#fff, $high-blue, 20%);
$high-blue-dark: mix(#000, $high-blue, 20%);

.element {
  color: $high-blue;
  box-shadow: 0 0 0 2px rgba($high-blue, 0.35);
}